<?php
namespace page;
use think\Paginator;
class Page extends Paginator
{
  
  //首页
  protected function home() {
    if ($this->currentPage() > 1) {
      return "<a href='" . $this->url(1) . "' title='首页'>首页</a>";
    } else {
      return "<p>首页</p>";
    }
  }
  
  //上一页
  protected function prev() {
    if ($this->currentPage() > 1) {
      return "<a href='" . $this->url($this->currentPage - 1) . "' title='上一页'>上一页</a>";
    } else {
      return "<p>上一页</p>";
    }
  }
  
  //下一页
  protected function next() {
    if ($this->hasMore) {
      return "<a href='" . $this->url($this->currentPage + 1) . "' title='下一页'>下一页</a>";
    } else {
      return"<p>下一页</p>";
    }
  }
  
  //尾页
  protected function last() {
    if ($this->hasMore) {
      return "<a href='" . $this->url($this->lastPage) . "' title='尾页'>尾页</a>";
    } else {
      return "<p>尾页</p>";
    }
  }
  
  //统计信息
  protected function info(){
    return "<p class='pageRemark'>共<b>" . $this->lastPage .
      "</b>页<b>" . $this->total . "</b>条数据</p>";
  }
  
  /**
   * 页码按钮
   * @return string
   */
  protected function getLinks()
  {
  
    $block = [
      'first' => null,
      'slider' => null,
      'last'  => null
    ];
  
    $side  = 3;
    $window = $side * 2;
  
    if ($this->lastPage < $window + 6) {
      $block['first'] = $this->getUrlRange(1, $this->lastPage);
    } elseif ($this->currentPage <= $window) {
      $block['first'] = $this->getUrlRange(1, $window + 2);
      $block['last'] = $this->getUrlRange($this->lastPage - 1, $this->lastPage);
    } elseif ($this->currentPage > ($this->lastPage - $window)) {
      $block['first'] = $this->getUrlRange(1, 2);
      $block['last'] = $this->getUrlRange($this->lastPage - ($window + 2), $this->lastPage);
    } else {
      $block['first'] = $this->getUrlRange(1, 2);
      $block['slider'] = $this->getUrlRange($this->currentPage - $side, $this->currentPage + $side);
      $block['last']  = $this->getUrlRange($this->lastPage - 1, $this->lastPage);
    }
  
    $html = '';
  
    if (is_array($block['first'])) {
      $html .= $this->getUrlLinks($block['first']);
    }
  
    if (is_array($block['slider'])) {
      $html .= $this->getDots();
      $html .= $this->getUrlLinks($block['slider']);
    }
  
    if (is_array($block['last'])) {
      $html .= $this->getDots();
      $html .= $this->getUrlLinks($block['last']);
    }
  
    return $html;
  }
  
  /**
   * 渲染分页html
   * @return mixed
   */
  public function render()
  {
    if ($this->hasPages()) {
      if ($this->simple) {
        return sprintf(
          '%s<div class="pagination">%s %s %s</div>',
          $this->css(),
          $this->prev(),
          $this->getLinks(),
          $this->next()
        );
      } else {
        return sprintf(
          '%s<div class="pagination">%s %s %s %s %s %s</div>',
          $this->css(),
          $this->home(),
          $this->prev(),
          $this->getLinks(),
          $this->next(),
          $this->last(),
          $this->info()
        );
      }
    }
  }
  
  /**
   * 生成一个可点击的按钮
   *
   * @param string $url
   * @param int  $page
   * @return string
   */
  protected function getAvailablePageWrapper($url, $page)
  {
    return '<a href="' . htmlentities($url) . '" rel="external nofollow" title="第"'. $page .'"页" >' . $page . '</a>';
  }
  
  /**
   * 生成一个禁用的按钮
   *
   * @param string $text
   * @return string
   */
  protected function getDisabledTextWrapper($text)
  {
    return '<p class="pageEllipsis">' . $text . '</p>';
  }
  
  /**
   * 生成一个激活的按钮
   *
   * @param string $text
   * @return string
   */
  protected function getActivePageWrapper($text)
  {
    return '<a href="" class=" rel="external nofollow" cur">' . $text . '</a>';
  }
  
  /**
   * 生成省略号按钮
   *
   * @return string
   */
  protected function getDots()
  {
    return $this->getDisabledTextWrapper('...');
  }
  
  /**
   * 批量生成页码按钮.
   *
   * @param array $urls
   * @return string
   */
  protected function getUrlLinks(array $urls)
  {
    $html = '';
  
    foreach ($urls as $page => $url) {
      $html .= $this->getPageLinkWrapper($url, $page);
    }
  
    return $html;
  }
  
  /**
   * 生成普通页码按钮
   *
   * @param string $url
   * @param int  $page
   * @return string
   */
  protected function getPageLinkWrapper($url, $page)
  {
    if ($page == $this->currentPage()) {
      return $this->getActivePageWrapper($page);
    }
  
    return $this->getAvailablePageWrapper($url, $page);
  }
  
  /**
   * 分页样式
   */
  protected function css(){
    return ' <style type="text/css">
      .pagination p{
        margin:0;
        cursor:pointer
      }
      .pagination{
        height:30px;
        white:100%;
        background-color:#EBEBEB;
      }
      .pagination a{
        display:block;
        float:left;
        margin-right:10px;
        padding:2px 12px;
        height:24px;
        border:1px #cccccc solid;
        background:#fff;
        text-decoration:none;
        color:#808080;
        font-size:12px;
        line-height:24px;
      }
      .pagination a:hover{
        color:#077ee3;
        background: white;
        border:1px #077ee3 solid;
      }
      .pagination a.cur{
        border:none;
        background:#077ee3;
        color:#fff;
      }
      .pagination p{
        float:left;
        padding:2px 12px;
        font-size:12px;
        height:24px;
        line-height:24px;
        color:#bbb;
        border:1px #ccc solid;
        background:#fcfcfc;
        margin-right:8px;
      }
      .pagination p.pageRemark{
        border-style:none;
        background:none;
        margin-right:0px;
        padding:4px 0px;
        color:#666;
      }
      .pagination p.pageRemark b{
        color:red;
      }
      .pagination p.pageEllipsis{
        border-style:none;
        background:none;
        padding:4px 0px;
        color:#808080;
      }
      .dates li {font-size: 14px;margin:20px 0}
      .dates li span{float:right}
    </style>';
  }
}